Emily from SWISCO responded:
November 5, 2021
Hello! It looks like you have either our S351-35, with a 15-002 bottom attachment, or S390-35, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 3430 spring strength option. If you have any questions just let us know! Comparison of the S351 and S390 balance shoes.
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